Pinch Resistor ESD Structure for Uniform Multi-Finger Triggering
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Solution Overview
Problem
Existing electrostatic discharge (ESD) protection devices in integrated circuits require complex and costly redesigns for each technology generation, exhibit non-uniform triggering in multi-finger devices, leading to high turn-on resistance and inefficient chip area usage.
Innovation Solution
A semiconductor structure incorporating a shallow trench isolation structure, an amorphous layer, and a pinch resistor between them, which provides a modulating resistance path and uniform triggering, allowing for efficient area usage and controllable trigger voltage in a lateral NPN structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing ESD protection devices (diodes, MOS transistors, bipolar transistors) are used, then ESD protection function is provided, but non-uniform triggering occurs in multi-finger devices causing high turn-on resistance and weak ESD protection robustness
Solution Approach 1:
The ESD protection device is divided into multiple fingers with individual pinch resistors, allowing each finger to trigger independently and uniformly. This segmentation ensures that current distributes evenly across all fingers during ESD events, eliminating the non-uniform triggering problem and reducing overall turn-on resistance.
Solution Approach 2:
Each finger of the multi-finger device is equipped with its own pinch resistor, providing localized control over triggering characteristics. This local quality enhancement ensures uniform triggering across all fingers while maintaining low turn-on resistance, directly addressing the reliability and ease of operation contradiction.
2Reliability
If existing ESD protection devices are used, then ESD protection function is provided, but chip area usage is inefficient
Solution Approach 1:
The pinch resistor structure serves multiple functions simultaneously: it provides ESD protection, enables uniform triggering across multi-finger devices, reduces turn-on resistance, and optimizes chip area usage. This multi-functionality allows the same structural element to address multiple contradictions, improving area efficiency while maintaining protection robustness.
3Productivity
If technology generation is advanced, then device performance is improved, but ESD protection devices require redesign and recharacterization increasing manufacturing complexity and cost
Solution Approach 1:
The pinch resistor structure provides a scalable solution where only parameter adjustments (such as resistor values and finger dimensions) are needed for technology generation advances, rather than complete redesign. This parameter-based adaptation reduces manufacturing complexity and cost while maintaining improved device performance across different technology nodes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution achieves lower turn-on resistance (Ron) and uniform current distribution with a smaller trigger voltage, enhancing ESD protection robustness and efficient chip area utilization.
Implementation Method 1
a pinch resistor between the shallow trench isolation structure and the amorphous layer
Data Source
AI summary
The present disclosure relates to semiconductor structures and, more particularly, to an electrostatic discharge device (ESD) with a pinch resistor and methods of manufacture. The structure includes: a semiconductor substrate; a shallow trench isolation structure extending into the semiconductor substrate; an amorphous layer in the semiconductor substrate and below the shallow trench isolation structure; and a pinch resistor between the shallow trench isolation structure and the amorphous layer.